Question

Demarco has 80 marbles, and he gives the same amount to Pedro and Jason. If Pedro's marbles are represented by the set 1, 5, 20, ?, what is the missing value?

a) 10
b) 15
c) 25
d) 30

Answer 1

Pedro's missing marble value in the set 1, 5, 20, ? is 24.

Step-by-step explanation:

Since Demarco gives the same amount of marbles to Pedro and Jason, we can divide the total number of marbles he has, which is 80, by 2 to find how many marbles each of them will receive. 80 divided by 2 is 40, so Pedro and Jason will each receive 40 marbles.

If Pedro's marbles are represented by the set 1, 5, 20, ?, we can see that the marbles are increasing by increments of 4. The missing value would be 20 + 4, which is 24.